About 25 of the 92 natural elements are known to be essential to life. Which four of these 25 elements make up approximately 96% of living matter? - ANSWERCarbon, Hydrogen, Nitrogen, Oxygen



What is the atomic number of an atom that has 6 protons, 6 neutrons, and 6 electrons? - ANSWER6



Which of these refers to atoms with the same atomic number but different atomic masses? - ANSWERIsotopes



Fluorine's atomic number is 9 and its atomic mass is 19. How many neutrons does fluorine have? - ...
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